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參數(shù)資料
| 型號(hào)： | ASM3I2531A-08TT |
| 廠(chǎng)商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | Low Frequency EMI Reduction |
| 中文描述： | 55 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | 4.40 MM, TSSOP-8 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大小： | 189K |
| 代理商： | ASM3I2531A-08TT |
November 2003
rev 1.0
Features
FCC approved method of EMI attenuation.
Generates a low EMI spread spectrum of the
input clock frequency.
Optimized for input frequency range between
35MHz – 55MHz.
Internal loop filter minimizes external
components and board space.
Frequency Deviation: ±1.65%.
Low inherent cycle-to-cycle jitter.
3.3 V or 5 V operating voltage.
CMOS/TTL compatible inputs and outputs.
Ultra low power CMOS design: 5.50 mA @3.3 V.
Supports notebook VGA and other LCD timing
controller applications.
Available in 8-pin SOIC and TSSOP.
Product Description
The ASM3P2531A is a versatile spread spectrum
frequency modulator designed specifically for a wide
range of clock frequencies. It reduces electromagnetic
interference (EMI) at the clock source allowing system-
wide reduction of EMI of downstream clock and data
Block Diagram
ASM3P2531A
Low Frequency EMI Reduction
1 of 8
Notice: The information in this document is subject to change without notice.
dependent signals. It allows significant system cost
savings by reducing the number of circuit board layers
and shielding traditionally required to pass EMI
regulations.
The ASM3P2531A modulates the output of a single PLL
in order to spread the bandwidth of a synthesized clock,
thereby decreasing the peak amplitudes of its harmonics.
This results in significantly lower system EMI compared
to the typical narrow band signal produced by oscillators
and most clock generators. Lowering EMI by increasing
a signal’s bandwidth is called spread spectrum clock
generation.
The ASM3P2531A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all-digital method.
Applications
The ASM3P2531A is targeted toward the notebook VGA
chip and other displays using an LVDS interface, PC
peripheral devices, and embedded systems
CLKIN
Crystal
Oscillator
Divider
Divider
Frequency
Feedback
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
MODOUT
PLL
VDD
VSS
STOP
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| ASM3P2531A | Low Frequency EMI Reduction |
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| ASM3I2531A-08SR | Low Frequency EMI Reduction |
| ASM3P2531A-08ST | Low Frequency EMI Reduction |
| ASM3I2531A-08ST | Low Frequency EMI Reduction |
相關(guān)代理商/技術(shù)參數(shù) |
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| ASM3I2531AF-08SR | 制造商:PULSECORE 制造商全稱(chēng):PulseCore Semiconductor 功能描述:Low Frequency EMI Reduction |
| ASM3I2531AF-08ST | 制造商:PULSECORE 制造商全稱(chēng):PulseCore Semiconductor 功能描述:Low Frequency EMI Reduction |
| ASM3I2531AF-08TR | 制造商:PULSECORE 制造商全稱(chēng):PulseCore Semiconductor 功能描述:Low Frequency EMI Reduction |
| ASM3I2531AF-08TT | 制造商:PULSECORE 制造商全稱(chēng):PulseCore Semiconductor 功能描述:Low Frequency EMI Reduction |
| ASM3I2531AG-08SR | 制造商:PULSECORE 制造商全稱(chēng):PulseCore Semiconductor 功能描述:Low Frequency EMI Reduction |
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